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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd460599bbc8916dfec9be23836d4b18c7e739f51b9ee8a0c0f3e101d0ca9b697' 
  AND token = 'QuNgMqUS4PiHtws0kkZEg2FzExrgLT+bCWG9A9A4T0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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