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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb8e1e667e62fc9bca1fcfbab5861ca5918c3cf85f8603719236fee96368578f' 
  AND token = 'x9sG/lDjADvOqn8SsKzMvF7CVzeQfhd9+na9Vcd1rG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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