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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db7dae1730582c7d4f115c17ba0850d602aadc0a0493ca89da087a9552f5109d' 
  AND token = 'hbiiACpiaO863UMxkFHNsbf/KXcKqYiGkYpJ5p8VuKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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