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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '496f519cfd195a1f36c7b1d6e670e2843c62f9c1ffe07c4b4c1f68e7a4b60dfd' 
  AND token = 'SoAdnz0DRkC6kK8IXJ9rJ19zqyIkDc2S1CJ0+sfKoZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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