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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55070d1ef7e5ccd9d146cc81e7dce564c09bda52a37fecf33e5e25c16faedbb3' 
  AND token = '72XjcYRg8Gw1YFt0L5uumIiff13jlYAxNmI37pt8K7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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