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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '088b139d9e3121a578d05b0f650081855729a976fe61fc7ea55df880b64c51f1' 
  AND token = 'MfK0sTrYUa3hySbYjeAV74PnTJSoSyVAax4Et8PsNkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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