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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60bd7c2554c91e7a15b88130881134648584f19d24b462c35ec5550eaabc4015' 
  AND token = '1igjnE42LF18k4iTL8+gpwREFBlDd6uWntHjF0rgpeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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