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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef0c17772c58afc3b6a53c7de3bb48631095e9a3a6084f0cb4fdff2b1cfde74f' 
  AND token = '5V9R4ab/jNCrq6tK9DVDWBoPf4zNcx6BQh4+FNETRLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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