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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7ebd3337556b934c0d21c50761f4ef94a6c2d77ea93a0f1f6b77edea5e8badb' 
  AND token = 'eZf8LRttgD5d60nFe7xz1WBkeBsX4TxqNIv5oDninmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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