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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac55c80990cdc669e06cfc13c50f33204c93164f6ade260cc952a51e3a954224' 
  AND token = 'd0KHpvqogaUgobPM5R9wlCKNPjMp1mtXjddjfwD+yp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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