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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f9dcebf351d8799761a8c6b56a13f6745228aeec41e93c33f929fbab00bd762' 
  AND token = 'BUtqwONcZpree86y4qZa+fObUy044k3W9O1k0wEO+5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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