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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '460ad774b6f4681efea4b9aad461d341654293b7f9883635e6cea96d9b88bca3' 
  AND token = 'sVvEDs05WI78ATVF1aVGE5FiRaJ6/ku498jY5kX4OfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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