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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cae014f4f4edf08cfedc53dcbaeb4f2fd18542d6ee4f44844ca52fa96264b56c' 
  AND token = '6aX/emNz9hQqQWS6AN5BasFg240W+r5QkQZadyhE20o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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