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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '651febe9e242436fd89a59dd0707d03d030c521792f23ad48c4158d4c84eedb6' 
  AND token = 'cNn3tGLZ10s44wNkSSaobmItVTxsCZEr1A++MOEDiBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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