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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12493ad3fdd7b15a04e88348c95071b0a9fe93f0ee645833695582465a7fc9e1' 
  AND token = 'vc3VMjev8lcfvuHN4PqbEMUncA8fLRZxRJMOKlzDk+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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