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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71eb926a196e01e286047e5045685453a9f40953054bf3de70a7964a46d3d9ba' 
  AND token = 'UOaBcFKKSqG9OkvMKE3SFC4Kno/pvLXVXRW/y+oZ5nY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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