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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf2b9b5806a33a3368e10835c540d37cbf767f6c71e2133af75cc7fd41564b79' 
  AND token = 'L55+qQasQsjw6wwhwQrmGIJpTdet6e0H0VaJXxI9r84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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