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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a85bc7bf7279a3107acf6ccf1f3d21f0538f332ad1b9600922f8ea5639d7e95' 
  AND token = 'zBtezAMk1/CACJJsfA7jvtow5POQpuHl/M+8bo0J7LY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}