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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd519137842b12955c8fa4a10f31321902c93b68cd8234c81a405de88d055b58d' 
  AND token = 'EbS+XLkD/cTosXDCBSuMdME9a4b59/rWgpubCkPxy/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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