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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58b5d5379efb5f901a1446b7595e7951df7ce11d0131ef46feeb7114df0494ac' 
  AND token = 'kJpARkrljUUn3+wNJh3Rmkh9SS8EpTwIQ24tjE03wFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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