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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1aef096d5dd9d39425dc1b3a95a381ac1f105086789a303fe50feead8ac18ff' 
  AND token = 'imnM+PcJqjzD/rdNjw+b2zfzYcrNOYwSM/yX/HIF/hY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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