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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7245278a5b541d97166d4ebdb9a76c71f0536e5b26ab3956fadc0f4cc8364cd' 
  AND token = 'd8rBzuJsJHaQUF9xYTn6h40pQk2WRjdN9sOQLaffclM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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