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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b391663c34d2cb4f572181878210626ba9020f8f78dfd98e9fa9c9df829bc8ee' 
  AND token = 'eHTo1sZW1rUvybPQUQ75PHN+5cKwjYRNTWb75MChuOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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