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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0f206cc22e35bfeba1ebb6b915de4a2c16c9623386009747b1338911547b9dd' 
  AND token = 'lW6IdxpiaGb0vCgmr7eQHZ2GowewkqxIqVzgzqDZn5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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