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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6919657394d13c2262d77b4f79410b51540badf1929472b091e076dcc8b09da2' 
  AND token = 'Fv/NDwXCM6e3mGbPypSBeKTAkmLqFHo/eEAN5s8Z4QA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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