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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32621dfd973c172cfd914be6fc5611a0eb6261159a0e436e73edf9a5e333d4d7' 
  AND token = '7aFxt8++tWIXalJzylYsDNTpH1wSXa6bma5KQBFIzxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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