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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e035f8e25e63e25a4c34834fe6c750937d76e3422a575db615b3f925f43245a6' 
  AND token = 'tr8tDFdIR2EtOXIUBZpcBh/lZBdd4qFNdEjvgC9n7PA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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