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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '797dade292286f4b402255d7c78191389bde2f76918b6abd14fae276001086cc' 
  AND token = 'AsVnzz+tNLiqchyq0lIQs4IqjxOEimVb72oWv79+0w8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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