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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f89899976a50fc23aae69fd2a33fda85d02faeb5ec511d03b4238cd28d04500b' 
  AND token = 'Yb9K8mHcRM5QLTh8qtI4pBcjX14ABrS8vg8xjikG6GM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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