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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bcf0dbc8b78a37c5ad5a2e994f5e4b68b50207e65a662b80a3ebe8774c97d4e' 
  AND token = 'qymq9wCQNtivnxc0OSYzi0hfbZcu4xrfDMHnOmNYvzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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