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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ad255fec0daa45adc685b29b332f265408ccc1b3615cae330e9be282db11a56' 
  AND token = '8emOMpzAelZmUdzW2yEe2vQ/3leDj7VkkNmWLu9mDpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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