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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc92b4d1003475ee2e61f20c9611274296061de378bab1a1947a6280b7e7818a' 
  AND token = 'Ar7n6hfYczmEDNo5/6FaJ6l3BXFQU0kesi0aj9J6QEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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