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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f84113a740f12b9d3a50c857f760c4755929a9cfdff8bf17aebc1756a4a2aa5a' 
  AND token = 'mR3t5LXhkKn+3Fanjh578X7B4bt4IJJvDH5h9AqrQD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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