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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a771c4ddc6f5b6a4f6d3084c6b70687fe9b0bdb3c305a32867055fa97b265e82' 
  AND token = '1kcNcriYzDV4XidjP4wP6eVpY4hbiH+xQZRhkXTDAWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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