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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83de04cf4e307785b8bddc4a7ebc1a620ef9d7c5a8c714b2852ff2eca07febdc' 
  AND token = '1FNJh7I8/6B3MYKc8qgSSyMC+Cw4jmpJXpK8k6uXpHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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