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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecf679b69192dd4a6687ed6ee4e2641ec4f94ea22741a070d319d585ed25fb98' 
  AND token = '8xIByE/PHUEzifTRc33+WUlMTOyER+DKTFo1+c3Zev4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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