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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19e762370207821f31fd5c7d70d17d605ffc89383696a00b16f725ae3a96ae75' 
  AND token = '4fxxRDlZp6VilPj+aNUhDUU+c4vJR6lahQtfH5XdOeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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