Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2a4cc98409f9d149dab5533dce85c8fec913ad3189e20d6da03239164219763' 
  AND token = 'T8bV1GkAjXIELABw/Lu+poq1SEQwcL6GNeo+iwQ7ZCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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