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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6720d32f625a31ab92d17aa28ea0e955c5060e90cb82b9563365612d669a238' 
  AND token = 'fKxoXorVx+kIGmN2+Sq1mZ0bUB0j8g6T+SkHRfszo8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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