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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ec425d2a9779165bb714ab15bf20876d421672e020d091e88d3f7ada71ce07e' 
  AND token = 'Jvg6B3QrlhOGuMfQPtCLeVs7XB8ZrMDoRKBC6QWSSyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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