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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c74bfe2d46d402101862bc7cf898fb79c17919d98a0e90eb4e1629a6593c6045' 
  AND token = 'GqkjeTae0qw4832QHC/ZmGucInEpmP1rld4GhC7kyys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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