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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c1b3c4a8544fc67d4f67622daee899e32fa6f8107a5cc58fcebcb96a3a8d20f' 
  AND token = 'TFCjXirmUy5o1I+diLiu0L6SlOa47Jo6E6ES3aANQ3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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