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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b9179a257ba1a9a405f7c18ae631a6c2b051a575023733dc23bada6ca0d3bed' 
  AND token = '1G8EcffctnSpeXiKNm74gQrHO3uB7lHKD8DT2MnaB/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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