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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '626327274084a0a3a3defc633c6bcead4db59e5ce3acaf2b221bd6c1b2829d7d' 
  AND token = 'vM4CMymh0TU3GUbtCVgo6iKNJhVCBkog8wTjpnguioo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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