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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b80949e7d19675614d64ee6035df7b05ee7415c5a17d6516ce9d6753c6af2b64' 
  AND token = 'MFCgV8AeXgi5fQIRS+uSGmzZIHjEVXN9/Y7ghC75C7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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