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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98d30a1a83548de8f72c1074817acbf60bb16ca8af10300066f81a37e66949d5' 
  AND token = 'xXlDw4ZRNPCPrwapkROb0L0PfkMs07u+UegOX8plN3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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