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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b840f8f3cf724ea411f838b497f80eb3b61a8e4596854be30c5473a842d5a0cf' 
  AND token = 'gY/tK+atIonq+BRtdi9XJe0PdihJ6nfc001p/ga3qIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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