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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efacaf3c02a2fc6fcf19609768407b688dfd411a2683906140ea2f6ac1a300cc' 
  AND token = '5YsstINlnYV8QC1X+GWRapWA7gykGqfl6zAKD+cf++E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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