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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '396110a875c474643d0cba17b14597b2e5254553c4fe09947c81b3722635e4c7' 
  AND token = 'hH6sZ4zY431ylnzFjbXTC6r+a7Y+NjJqoyxpAw6Te2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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