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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7793eb0c934049aea510e51f620aad0ae1827f422c8e1e89d679f23d2d14c9b6' 
  AND token = '6C7zh9IPxqKp8d76JMZVADhJtWfwMWwaI/pQkXpAQ2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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