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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '244adff6e8026d28d7bb2655f2ce75f3f342e33572f10cdc4409f933051f0ae5' 
  AND token = 'GbFP7leMXWco6ymLpqUwUOvW58i6AAuP6F+rBaj4Hf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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