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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4ef1353020a7f7c0d9363f6118d884a795474f8b28e93dce92ac3138477192d' 
  AND token = 'JsXd5X6zAdPDr6e4l/slu6gDh9om7AwGEN5jW/hCYs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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