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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47a325d1dabec626ff0e42b015dcd077ce72af5276cb11914b3a1a6a1695d0f6' 
  AND token = 'j2+Px+7/lBHQXSLu5M8AqPe1gUYY0uDrvfL3QjfgHSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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