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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5050071db0b7f91f3cb78641be9a9c3190e5d49494ac7d383775178626e93b8a' 
  AND token = 'P2Zz3xb52UC6qiwfxgw9yun1U15bsCM3bXXje9a9Pzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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