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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77b96943de0eba6c96b3f4b371b3b468730158f8b0f6bb62ae83f3d86792389a' 
  AND token = 'DNoStzaWe3sGDtpUl5oabUT5TZ+JEWtpIzb6ReV4L3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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