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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0aa474dc8255567ef9012f70025043937cd56f80990ff71bfa30f1303823dd38' 
  AND token = '8AFa3roEAs5j2NSg+x7bT3mIGKuou0bUwmmnxGfCL4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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