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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f1adb6faac2a8b971cfd77af20b5d6c60ea561bc3a3cc5cb045c7f7b413bbc9' 
  AND token = '/pOqKJ6yfYYmLBtU2erEGAh3LO2aa2+iHnrdSvRz/NQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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