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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e91b9dfe976518122238425c502464093d13a57b61273d318e341c8e62d8b43' 
  AND token = 'uKc0bYGZsQeC0+T4eO7NkA0pnyhNDWrdGM8iSWGIRsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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