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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '717607ba253e5c996bf720a040af6a8b9f3578403f61a8077900c31bb0f9bc93' 
  AND token = 'rHpjQFgKuEV8fa0sabj259hGQI+5FIIYuF/BiiD7p1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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