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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fa56cca741b751730a37fe9deb17195f76b56a4306096a597698eb81de80c46' 
  AND token = 'SjTRmktioAAsAzlDklQJw4uv4GuqOM6iQsQ5IAR5dV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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