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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1730a60f3cf0d58c1b36c7c347a91f11380f61fe07fcbfa34d651a2a8f09345' 
  AND token = 'kWCiVaaZnbMh3mjfnEapJOClIx9GjYMilakN6UwSbtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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