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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '404e83927c0ae6b16cd8f49b70b35258e7f09681aa50e44aea7516080c3627b9' 
  AND token = 'Zv50LZwCPSUac85VZGNUv8g/gZOQ7fJxMrSGkZnJE+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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